Cleaning device for moving grates



Dec. 28, 1926; 1,612,231

- 1.. STEINMULLER CLEANING DEVICE FOR MOVING GRATES Filed April 2'7, 1926 2 Sheets-Sheet l Dec. 28. 1926, 1,612,231

L. STEINMULLER CLEANING DEVICE FOR MOVING GRATES Filed April 27,1926

I 2 SheetsShee*L 2 Patented Dec. 28, 1926.

cru se stares LEBRECHT STEINMFLLER, OF GUMMERSBACH /BHEINLA1 TID, GERMANY, ASSIGNQB TO THE FIRM L. 86 C. .STEINMTTLLER, OF GUMMERSBACH/RHEINLAI-TD, GERMANY.

CLEANING BEVICE FOR MOVING GEATES.

Application fileclApril 27, 1926, Serial No. 105,010, and in Germany April 4, 1925.

In moving grates it is essential to keep the air apertures between the fire-bars free from clinker and ashes, so as to ensure a uniform and continuous supply of air for combustion. It has already been sought to ensure this through a hammer action, which strikes against the travelling furnace bar moving upwards at the front end of the grate, in order to loosen the pieces of clinker by means of the shaking action and cause them to fall.

Such a hammer action causes a loud noise and destructive action, so that the result is that the furnace bars are injured by the hammering, and the working of the deviceis not efiicient. It has also been proposed to break up clinkers above the horizontal span of the grate by reciprocating bars arranged immediately above the grate, but such devices do not act at the most effective location for removing clinkers and ashes and further are quickly destroyed by heat within the burning bed of fuel.

l-iccordingto the invention the cleaning device is so constructed, that it gives the furnace bars, which as usual are not fixedly mounted in their supports, a to-and-fro swinging motion, that is to say, a shaking motion. This shaking motion can be produced by blows against the furnace bars, but the blows required are in no way greater, so that the danger of destruction of the furnace bars and the production of an excessive noise is avoided. The swinging or shaking motion of the furnace bars effects by continual repetition a loosening and breakingup of the clinker and ashes fused or collected together between them, so that the latter are released and fall through the bars.

Several constructional examples of the object of the invention are shown in the drawingz Figs. 1 and 2 show a constructional form partly in side and partly in end elevation.

Figs. 3-6 show a second constructional form, in which only the particular parts are shown, which are necessary for the understanding of the invention.

In Fig. 1, g is the front grate drum, on which two straight furnace bars f are diagrammatically shown, which are carried on cross-bearers f in known manner. In front of the grate and within the casing 2 is provided a double-armed lever a universally mounted on axles b and 0 at right angles to each other, a spring (Z acting on the lever a at an angle so that it seeks to move it simultaneously towards the wall a and, as seen in 2, towards the left, so that'a pin 2' located at right angles at its lower end is held in contact with a toothed disc A similar double-armed lever is also provided at the other side of the grate, bot-h levers being provided above with a transverse guide 71, extending across the breadth of the grate. Above the links b c is provided on the double-armed lever a, a roller 6 as an operatdevice. The furnace bar f on its rotatory movement presses by means of the roller 0 the upper arm of the double-armed lever a against the iressure of the spring CZ so far back. that it can pass under the guide h. When therefore the furnace bar has passed the roller 6, the roller falls and the parts take the position of 1, that is to say, the guide comes in position against the upper part of the straight furnace bars. By this means there results a knocking or pushing action, which effects the loosening of the ashes and clinker already collected on the furnace bars. During the further motion of the furnace bar f under the guide h, the double-armed lever a will now receive a toand-fro motion from the toothed disc 76, which for that purpose is set in rotation from the driving gear for the moving hearth, as Shown by the double arrow in 2, and thereby the guide 72, engages the furnace bars f on their left hand edges as regards Fig. 1; the furnace bars are also given a to-and-fro movement round their supporting point on the guides f, and this motion is e fected by the employment of teeth on the wheel is, as shown in Fig.2 of different shapes, for example, sharper in one direction than in the other. The shaking motion thus obtained can be varied according to the shape and number of the teeth, the speed of rotation of the the roller (5 should be actuated from the furnace bars, for a curved disc located some where on the spindle of the drum 9 of the grate could also be used and, there is then the option whether the guide it shall operate on the furnace bars by a shock of any de sired strength or without a shock.

In the constructional examples according to Figs. 3-6 a guide corresponding to the part it of Figs. 1 and 2 is completely lacking.

In Fig. 4 a shaft or rod 6' is located before the front grate drum g; on this single elements a are provided, which have the shape of a one-arm lever with curved surfaces on the part adjacent to the hearth or the furnace bars f. The elements a, which are arranged closely against each other on the rod t, are rotatable thereon, so that they may rest by means of their own weight against the furnace bars f l). Their motion against the travelling hearth is lim ited by projections 12 and 21;, which are lo cated partly on the arms a and partlyon the grate rods t.

During the drive the rods 6 receive a to-and-fro motion in the direction of their own axes and carry therewith the arms u located thereon: the latter, which for the purpose are provided with serrated or similar edges as shown in Fig. 6 resting on the furnace bars effect thereby the above-described swinging or shaking movement.

A device corresponding to the roller 6 as provided in Figs. 1 and 2 for the double armed lever a is not necessary, because the arm a, which can swing towards the right, referring to Fig. 4, only until contact is made with the projections 12 and w, engages under each set of furnace bars and automatically is brought into the operative position as shown in Fig. t.

An example of a drive for the rod 25 is shown in Figs. 3 and 5. From the grate drive, a crank 0 with its shaft 39 is set in oscillatory motion through a connecting rod 01 and a gear indicated by m. On the shaft 3) is located as shown in Fig. 5 at both sides of the moving grate a double-armed lever g, which is connected through rods 7 with an upper double-armed lever s, which is provided with threads engaging with corresponding threads formed on the end of the shaft 25. The double-armed lever a is of course so arranged, that it cannot move in an axial direction. The double-armed lever .9 is thus set in oscillatory motion from the grate drive (or this could be effected in an other manner) and this gives the shaft L an axial reciprocatory motion with the abovedescribed result. The drive of the doublearmed lever s or some equivalent part can naturally either be effected from the gear on or directly, if the dimensions. conditions and so on of the moving grate furnace permit. The particular drive in Figs. 8 and 5 is chosen on the assumption that space, through the detached toothed wheel mechanism, for the driving of the moving grate is limited. The shaft t, which carries the arms to, must of course be so placed, that it can move freely in the direction of its axis, but is not rotatable.

llaving now particularly described and ascertained the nature of my invention and in what manner the same is to be performed, I declare that what I claim is l. A cleaning device for moving chain grate having laterally shiftable links consisting of a transverse bar disposed beyond the rear end of the grate surface and contacting the peripheral surface of the grate it passes around the end of its path, and means to move the bar transversely over the surface of the grate as it is held thereagainst, whereby the links are cleaned on their outer surface and moved apart to clean the spaces between them.

2. A cleaning device for a moving chain grate having laterally shiftable links comi-rising in combination a transverse bar diss face and contacting the peripheral surface of the grate as it passes around the end of its path, a pivot for said bar to permit it to move toward and away from the grate, said bar being normally biased against the surface of the grate, and means to give the bar a substantially reciprocating movement over the surface of the grate.

3. A. cleaning device for a moving chain grate comprising in combination a shaft which is movable axially but is secured against rotation, a lever having screw threaded relation with the shaft which is free to swing but which cannot move axially, means connected to'the lever to move it to cause endwise movement of the shaft, and a cleaning member swingably and nonslidably mounted on the shaft, said member being biased toward the surface of the grate and being moved transversely over the surface of the grate by the movement of the shaft.

i. A cleaning device for a moving chain grate comprising in combination a shaft which is movable axially but is secured against rotation, a lever having screw threaded relation with the shaft which is free to swing but which cannot move axially, means connected to the lever to move it'to cause endwise movement of the shaft, and a cleaning member swingably and nonslidably mounted on the shaft, said member being biased toward the surface of the grate and being moved transversely over the surface of the grate by the movementof the shaft, said member having a serrated surface in contact with the grate.

in testimony whereof I afiix my signature.

DR. LEBREOHT STEINMI'J'LLER. 

